/**对es的二次封装 */
#pragma once
#include <elasticlient/client.h>
#include <cpr/response.h>
#include <json/json.h>
#include <memory>
#include <iostream>
#include "logger.hpp"

namespace my
{

    bool Serialize(const Json::Value &val, std::string &result)
    {
        // 1.先定义Json::StreamWriter 的工厂类 Json::StreamWriterBuilder
        Json::StreamWriterBuilder swb;
        // 2.定义序列化对象
        std::unique_ptr<Json::StreamWriter> sw(swb.newStreamWriter());
        // 3.通过Json::StreamWriter中的write接口进行序列化
        std::stringstream ss;
        int ret = sw->write(val, &ss);
        if (ret != 0)
        {
            std::cout << "Json序列化失败" << std::endl;
            return false;
        }
        result = ss.str();
        return true;
    }

    bool Deserialize(const std::string &src, Json::Value &val)
    {
        // 1.先定义Json:: CharReader 的工厂类Json::CharReaderBuilder工厂类
        Json::CharReaderBuilder crb;
        // 2.定义反序列化对象
        std::unique_ptr<Json::CharReader> cr(crb.newCharReader());
        std::string err;
        bool ret = cr->parse(src.c_str(), src.c_str() + src.size(), &val, &err);
        if (ret == false)
        {
            std::cout << "Json反序列化失败" << err << std::endl;
            return false;
        }
        return true;
    }

    // 一个es的json
    class ESIndex
    {
    public:
        // 指定es的索引名称与类型(固定格式)
        ESIndex(std::shared_ptr<elasticlient::Client> &client,
                const std::string &indexName,
                const std::string &type = "_doc")
            : _indexName(indexName),
              _type(type),
              _client(client)
        {
            Json::Value analysis;
            Json::Value analyzer;
            Json::Value ik;
            Json::Value tokenizer;
            tokenizer["tokenizer"] = "ik_max_word";
            ik["ik"] = tokenizer;
            analyzer["analyzer"] = ik;
            analysis["analysis"] = analyzer;
            _index["settings"] = analysis;
        }

        // 新增一个子字段
        ESIndex &append(const std::string &key,
                        const std::string &type = "text",
                        const std::string &analyzer = "ik_max_word",
                        bool enabled = true)
        {
            Json::Value fields;
            fields["type"] = type;
            fields["analyzer"] = analyzer;
            if (enabled == false)
                fields["enabled"] = enabled;
            _properties[key] = fields;
            return *this;
        }

        bool create(const std::string &index_id = "default_index_id")
        {
            Json::Value mappings;
            mappings["dynamic"] = true;
            mappings["properties"] = _properties;
            _index["mappings"] = mappings;

            std::string body;
            bool ret = Serialize(_index, body);
            if (ret == false)
            {
                LOG_ERROR("索引序列化失败！");
                return false;
            }
            LOG_DEBUG("{}", body);
            // 2. 发起搜索请求
            try
            {
                auto rsp = _client->index(_indexName, _type, index_id, body);
                if (rsp.status_code < 200 || rsp.status_code >= 300)
                {
                    LOG_ERROR("创建ES索引 {} 失败，响应状态码异常: {}", _indexName, rsp.status_code);
                    return false;
                }
            }
            catch (std::exception &e)
            {
                LOG_ERROR("创建ES索引 {} 失败: {}", _indexName, e.what());
                return false;
            }
            return true;
        }

    private:
        Json::Value _index;
        std::string _indexName;
        std::string _type;
        std::shared_ptr<elasticlient::Client> _client;
        Json::Value _properties;
    };

    // 数据的新增
    class ESInsert
    {
    public:
        ESInsert(std::shared_ptr<elasticlient::Client> &client,
                 const std::string &name,
                 const std::string &type = "_doc")
            : _name(name), _type(type), _client(client)
        {
        }

        // 一个模板
        template <typename T>
        ESInsert &append(const std::string &key, const T &val)
        {
            _item[key] = val;
            return *this;
        }

        // 针对字符串的新增
        bool insert(const std::string id = "")
        {
            std::string body;
            bool ret = my::Serialize(_item, body);
            if (ret == false)
            {
                LOG_ERROR("索引序列化失败！");
                return false;
            }
            LOG_DEBUG("{}", body);
            // 2. 发起搜索请求
            try
            {
                auto rsp = _client->index(_name, _type, id, body);
                if (rsp.status_code < 200 || rsp.status_code >= 300)
                {
                    LOG_ERROR("新增数据 {} 失败，响应状态码异常: {}", body, rsp.status_code);
                    return false;
                }
            }
            catch (std::exception &e)
            {
                LOG_ERROR("新增数据 {} 失败: {}", body, e.what());
                return false;
            }
            return true;
        }

    private:
        std::string _name;
        std::string _type;
        Json::Value _item;
        std::shared_ptr<elasticlient::Client> _client;
    };

    // 删除
    class ESRemove
    {
    public:
        ESRemove(std::shared_ptr<elasticlient::Client> &client,
                 const std::string &name,
                 const std::string &type = "_doc") : _name(name), _type(type), _client(client) {}

        bool remove(const std::string &id)
        {
            try
            {
                auto rsp = _client->remove(_name, _type, id);
                if (rsp.status_code < 200 || rsp.status_code >= 300)
                {
                    LOG_ERROR("删除数据 {} 失败，响应状态码异常: {}", id, rsp.status_code);
                    return false;
                }
            }
            catch (std::exception &e)
            {
                LOG_ERROR("删除数据 {} 失败: {}", id, e.what());
                return false;
            }
            return true;
        }

    private:
        std::string _name;
        std::string _type;
        std::shared_ptr<elasticlient::Client> _client;
    };

    class ESSearch
    {
    public:
        ESSearch(std::shared_ptr<elasticlient::Client> &client,
                 const std::string &name,
                 const std::string &type = "_doc") : _name(name), _type(type), _client(client) {}

        ESSearch &append_must_not_terms(const std::string &key, const std::vector<std::string> &vals)
        {
            Json::Value fields;
            for (const auto &val : vals)
            {
                fields[key].append(val);
            }
            Json::Value terms;
            terms["terms"] = fields;
            _must_not.append(terms);
            return *this;
        }

        ESSearch &append_should_match(const std::string &key, const std::string &val)
        {
            Json::Value field;
            field[key] = val;
            Json::Value match;
            match["match"] = field;
            _should.append(match);
            return *this;
        }

        ESSearch &append_must_term(const std::string &key, const std::string &val)
        {
            Json::Value field;
            field[key] = val;
            Json::Value term;
            term["term"] = field;
            _must.append(term);
            return *this;
        }

        ESSearch &append_must_match(const std::string &key, const std::string &val)
        {
            Json::Value field;
            field[key] = val;
            Json::Value match;
            match["match"] = field;
            _must.append(match);
            return *this;
        }
        Json::Value search()
        {
            Json::Value cond;
            if (_must_not.empty() == false)
                cond["must_not"] = _must_not;
            if (_should.empty() == false)
                cond["should"] = _should;
            if (_must.empty() == false)
                cond["must"] = _must;
            Json::Value query;
            query["bool"] = cond;
            Json::Value root;
            root["query"] = query;

            std::string body;
            bool ret = my::Serialize(root, body);
            if (ret == false)
            {
                LOG_ERROR("索引序列化失败！");
                return Json::Value();
            }
            LOG_DEBUG("{}", body);

            // 2. 发起搜索请求
            cpr::Response rsp;
            try
            {
                rsp = _client->search(_name, _type, body);
                if (rsp.status_code < 200 || rsp.status_code >= 300)
                {
                    LOG_ERROR("检索数据 {} 失败，响应状态码异常: {}", body, rsp.status_code);
                    return Json::Value();
                }
            }
            catch (std::exception &e)
            {
                LOG_ERROR("检索数据 {} 失败: {}", body, e.what());
                return Json::Value();
            }

            // 3. 需要对响应正文进行反序列化
            LOG_DEBUG("检索响应正文: [{}]", rsp.text);
            Json::Value json_res;
            ret = my::Deserialize(rsp.text, json_res);
            if (ret == false)
            {
                LOG_ERROR("检索数据 {} 结果反序列化失败", rsp.text);
                return Json::Value();
            }
            return json_res["hits"]["hits"];
        }

    private:
        std::string _name;
        std::string _type;
        Json::Value _must_not;
        Json::Value _should;
        Json::Value _must;
        std::shared_ptr<elasticlient::Client> _client;
    };
}